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C11 > Networks and Nanomaterials > Flashcards

Networks and Nanomaterials Flashcards

1
Q

Describe covalent network lattice

A

Strong covalent bonding exists in three dimensions

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2
Q

State what gives diamonds their characteristics malleability

A

3D lattice of covalently bonded carbon atoms

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3
Q

State how carbon atoms in diamond are arranged

A

Covalent network lattice

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4
Q

State how carbon atoms in silicon dioxide are arranged

A

Covalent network lattice

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5
Q

Outline 5 common properties of covalent network lattices

A
  1. strong 3D covalent bonding
  2. no free ions/electrons
  3. brittle (must be cut in a specific way or will shatter)
  4. chemically inert
  5. insoluble in water (and most other solvents)
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6
Q

State whether or not covalent network lattices possess free ions or electrons

A

No.

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7
Q

Describe what may occur if the bonding in a covalent network lattice breaks

A

Lattice becomes distorted

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8
Q

Outline the solubility of covalent network lattices in water

A

Insoluble

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9
Q

State whether or not covalent network lattices are soluble in most solvents

A

No

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10
Q

State how carbon atoms in graphite are arranged

A

Covalent layer lattice

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11
Q

Describe covalent layer lattices

A

Strong covalent bonding exists in two dimensions to form a layer

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12
Q

State what the layers in the covalent layer lattice are held together by

A

Weak dispersion forces

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13
Q

State how carbon atoms in buckyballs are arranged

A

Hollow sphere

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14
Q

State how carbon atoms in nanotubes are arranged

A

Sheets of hexagonally arranged carbon atoms formed into cylinders

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15
Q

Outline 1 major characteristic of covalent layer lattices

A

Delocalised electrons are able to move across lattice layers and allow for electrical conduction

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16
Q

Provide 3 examples of fullerenes

A
  1. buckyballs
  2. nanotubes
  3. graphene
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17
Q

Describe the strength of nanotubes in comparison to steel

A

100 times stronger than steel (with one fifth of the density)

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18
Q

State how carbon atoms in graphene are arranged

A

Flat layer of one-atom-thick carbon

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19
Q

State from which material graphene is obtained from

A

Graphite

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20
Q

State whether or not graphene conducts heat and electricity better than metal

A

Yes.

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21
Q

Describe the SA:V ratio of graphene

A

Very high SA:V which allows it to have close contact with other materials

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22
Q

Describe what characteristic of graphene allows it to readily combine to form composites
with surrounding polymers

A

Rippled surface

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23
Q

State 3 ways atoms can become stable

A
  1. giving electrons
  2. taking electrons
  3. sharing electrons
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24
Q

State what forms when metallic atoms combine

A

Metallic lattice

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25
Q

State what forms when metallic and non-metallic atoms combine

A

Ionic lattice

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26
Q

State what forms when non-metallic atoms combine

A

Covalent lattice

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27
Q

State the 3 types of covalent lattices

A
  1. covalent molecular lattice
  2. covalent network lattice
  3. covalent layer lattice
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28
Q

State what type of particles compose ionic lattices

A
  • cations

- anions

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29
Q

State what types of particles compose covalent molecular lattices

A
  • molecules
30
Q

State what types of particles compose covalent network lattices

A
  • atoms
31
Q

State what types of particles compose covalent layer lattices

A
  • atoms
32
Q

State the 3 main types of bonding

A
  1. ionic
  2. metallic
  3. covalent
33
Q

State the 2 ways the bonding of a substance can be determined

A
  1. substance properties

2. composition of the substance

34
Q

Describe the characteristic melting point of metallic lattices

A

High

35
Q

Describe the characteristic melting point of ionic lattices

A

High

36
Q

Describe the characteristics melting point of covalent molecular lattices

A

Low

37
Q

Describe the characteristics melting point of covalent network lattices

A

Very high

38
Q

Describe the characteristic melting point of covalent layer lattices

A

Very high

39
Q

Describe the characteristics hardness of metallic lattices

A

Varies

40
Q

Describe the characteristic hardness of ionic lattices

A

Hard

41
Q

Describe the characteristic hardness of covalent molecular lattices

A

Soft

42
Q

Describe the characteristic hardness of covalent network lattices

A

Hard

43
Q

Describe the characteristic hardness of covalent layer lattices

A

Soft

44
Q

Describe the characteristic electrical conductivity (in solid form) of metallic lattices

A

Good

45
Q

Describe the characteristic electrical conductivity (in solid form) of ionic lattices

A

Poor

46
Q

Describe the characteristics electrical conductivity (in solid form) of covalent molecular lattices

A

Poor

47
Q

Describe the characteristic electrical conductivity (in solid form) of covalent network lattices

A

Poor

48
Q

Describe the characteristic electrical conductivity (in solid form) of covalent layer lattices

A

Good

49
Q

Describe the characteristic electrical conductivity (in liquid form) of metallic lattices

A

Good

50
Q

Describe the characteristic electrical conductivity (in liquid form) of ionic lattices

A

Good

51
Q

Describe the characteristic electrical conductivity (in liquid form) of covalent molecular lattices

A

Poor

52
Q

Describe the characteristic electrical conductivity (in liquid form) of covalent network lattices

A

N/A

53
Q

Describe the characteristic electrical conductivity (in liquid form) of covalent layer lattices

A

N/A

54
Q

Describe the characteristic solubility of metallic lattices in water

A

Insoluble

55
Q

Describe the characteristic solubility of ionic lattices in water

A

Most are soluble

56
Q

Describe the characteristic solubility of covalent molecular lattices in water

A

Soluble if polar

57
Q

Describe the characteristic solubility of covalent network lattices in water

A

Insoluble

58
Q

Describe the characteristic solubility of covalent layer lattices in water

A

Insoluble

59
Q

Describe the 3 classifications of substances

A
  1. metal
  2. non-metal
  3. both metal and non-metal
60
Q

State the name of a metallic lattice if the cations are identical

A

Pure metal

61
Q

State the name of a metallic lattice if there is a mixture of cations

A

Alloy

62
Q

State the 2 types of metallic lattices

A
  1. pure metals

2. alloys

63
Q

State the 4 types of existence of non-metals

A
  1. atom
  2. molecule
  3. covalent lattice
  4. discrete atoms/molecules
64
Q

State what 2 types of structures non-metals in a gaseous formation exist in

A
  1. atom

2. molecule

65
Q

State what 2 types of structures non-metals in solid and liquid formation exist in

A
  1. covalent lattice

2. discrete atoms/molecules

66
Q

State the 2 possible dimensions of covalent lattices

A
  1. two dimensional

2. three dimensional

67
Q

Describe the 2 classifications of molecules

A
  1. polar

2. non-polar

68
Q

Describe the 2 classifications of molecules

A
  1. polar

2. non-polar

69
Q

State the covalent lattice with a two dimensional structure

A

Covalent layer lattice

70
Q

State the covalent lattice with a three dimensional structure

A

Covalent network lattice

71
Q

Provide the name of the state which atoms and molecules of non-metal substances exist

A

Gaseous

72
Q

Provide the name of the state which covalent lattice and discrete atoms/molecules of non-metal substances exist

A

Solid or liquid

C11 (13 decks)

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